Wiring for Center RF Wireless Thermostat.

[Neil Stevens]

I am wiring a thermostat into my combi boiler. The live brown and blue neutral I am fine with. I can see from the wiring diagram that the two terminals A and B on the receiver box are used. There are two wires from the boiler coloured black and grey. Which goes to which? I understand from what I have read that T1 (call for heat) is the black wire and T2 (return) is the grey but I wanted to be absolutely sure.

Thanks

 

[Neil Stevens]

I read too that as it's a low-voltage set up, it doesn't actually matter which way they are connected....

 

[UNG]

A lot depends on which boiler you have some use mains voltage on the thermostat some are low voltage